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 * @Author: wzh 
 * @Date: 2020-11-20 13:19:45 
 * @Last Modified by:   1521620993@qq.com 
 * @Last Modified time: 2020-11-20 13:19:45 
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  <title>04-属性值计算过程</title>
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<body>
  <style>
    div{
      text-align: center;
      height: 100px;
      background-color: pink;
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    h1{
      color: maroon;
      font-weight: normal;
      font-style: italic;
    }
    div .red{
      color: red;
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    h1.blue{
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  <div>
    <h1 class="red blue">属性值计算过程</h1>
  </div>
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